<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      //1.创建一个xhr，网络请求对象
      const xhr = new XMLHttpRequest()

      //2.调用open方法，传入请求方式，请求地址
      xhr.open('GET', 'http://ajax-api.itheima.net/api/province')

      //3.调用send方法
      xhr.send()

      //4.监听请求状态
      xhr.onreadystatechange = function () {
        if (xhr.readyState === 4 && xhr.status >= 200 && xhr.status < 300) {
          //获取响应数据
          console.log(JSON.parse(xhr.responseText))
        }
      }
    </script>
  </body>
</html>
